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Factors Affecting Online Payment Method Decision Behavior of Consumers in Vietnam
NGUYEN, Thi Phuong Linh,NGUYEN, Van Hau Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.10
E-commerce development led to the explosion of online payment. Consumers have many choices when deciding on the online payment method for each transaction. Using a combination of both qualitative and quantitative methods with the help of SPSS AMOS version 22.0, the article explores the factors that influence consumers' online payment method decision behavior in Vietnam. Research results show that awareness of usefulness, awareness of risk, awareness of trust, awareness ease of use, product uncertainly perception and perceived behavioral control have effects on the behavior of deciding on online payment methods. Awareness of risk has the strongest negative impact on online payment method decision behavior and awareness of usefulness has the strongest positive impact on online payment method decision behavior. Based on these important results, the article proposes a number of implications: (i) continuing to invest and upgrade modern technology to ensure customer information absolutely confidential; (ii) converting all ATM cards on the market to EMV chip standard card technology; (iii) improving service activities, quickly handle things to create confidence for customers; (iv) credit institutions operating in the field of online payment linked to e-commerce sites, supermarkets, convenience stores, restaurants must ask partners to increase transparency for the products.
Nguyen Thanh-Nho,Thai Huynh-Thuc,Le-Thi Anh-Dao,Do Minh-Huy,Le-Thi Huynh-Mai,Le Quang-Huy,Nguyen-Thi Kim-Sinh,Nguyen Cong-Hau 한국분석과학회 2023 분석과학 Vol.36 No.5
Aluminium (Al) is one of the major elements in rocks and its concentration can be varied, depending on different rock types as well as sources. The present study aimed to propose an analytical method based on the UV-Vis as a cheap, simple, and common instrument equipped in most laboratories for Al quantification in rocks after the microwave assisted acid digestion. The aluminone and 8-hydroxyquinoline were investigated for the colorimetric assay. The results show that the 8-hydroxyquinoline reagent was more favorable in terms of the minimized affects of the potential interferences present in the digested solutions, i.e., Fe3+, Si4+ and F–. The calibration curve was constructed from 0.10 mg/L to 3.00 mg/L with the goodness of linearity (R2 = 0.9996). The limits of detection and quantification (LOD and LOQ) were estimated, i.e., 0.029 mg/L and 0.087 mg/L, respectively. The 8-hydroxyquinoline was applied to real rock samples, demonstrating favorable precision (RSD = 0.34 %-1.8 %) and no remarkable differences were found compared to the inductively coupled plasma-mass spectrometry (ICP-MS) as a reference measurement approach.
NGUYEN, Van Hau,NGUYEN, Thi Phuong Linh Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.10
The purpose of this paper is to investigate the factors influencing the Vietnamese farmers' intention to accept organic farming based on the theory of planned behavior (TPB). After in-depth interviews with five agricultural researchers and five farmers, the authors have identified a formal research model and built a complete survey. Data were collected from 318 farmers in Hanoi, Vietnam, by surveying directly at their homes or farms. Statistical methods, such as Cronbach's alpha, exploratory factor analysis (EFA) and linear regression analysis, were used to analyze the data with the help of SPSS 22.0 and AMOS 24.0. The results show that attitudes, subjective norms, and perceived behavioral control have a positive influence on farmers' intention to accept organic farming in Vietnam. Based on the degree of impact of these factors, the authors give a few suggestions to state management agencies to promote the intention to accept organic farming in Vietnam: (i) increasing awareness of the difference between organic farming and conventional farming, the role of organic farming in health and the environment; (ii) increasing the activities of guiding the organic farming practices and facilitating the farmers to access these guides through many channels; and (iii) holding sessions to share practices in organic farming practices.
Evaluation of Auditors' Professional Skills in Local Auditing Firms in Hanoi
NGUYEN, Thi Hanh Duyen,LE, Van Luyen,HAU, Nguyen Van,DO, Duc Tai,THAO, Nguyen Thi Thu Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.9
In recent years, the quality of auditing human resources in domestic auditing firms in Hanoi has certain limitations in which professional skills of auditors have not been given adequate attention. The number of customers at local auditing firms is forecast to increase gradually. Therefore, the quantity and quality of auditors need to be improved to meet requirements of the workload. Data for this research were collected through surveying 120 customers of domestic auditing firms in Hanoi on the 5-point Likert scale. Based on the collected data, we employ both qualitative and quantitative methodology along with some tools such as descriptive statistics, Cronbach's Alpha, T-test and ANOVA to analysis, evaluate and measure the professional skills of auditors in local auditing firms in Hanoi. The results show that the professional skills of auditors in auditing firms include 17 attributes. The majority of respondents show appreciation for the professionalism and professional competence of auditors, while, they think that critical thinking skills and creative thinking skills are still limited and need to be improved. These findings, not only help auditors to improve themselves, but also provide solutions for managers of domestic auditing firms in Hanoi to enhance quality of audited human resources.
NaClO3를 함유한 염산용액으로 몰리브데나이트광의 침출
Thi Nhan Hau Nguyen,Thi Thu Huong Nguyen,이만승 한국자원리싸이클링학회 2022 資源 리싸이클링 Vol.31 No.5
Molybdenum is widely used in many materials; thus, its recovery from ores and secondary resources has attracted considerable attention. In this study, the leaching of molybdenite ore using hydrochloric acid containing sodium chlorate as an oxidizing agent was studied. The effects of several variables, such as the concentrations of HCl and NaClO3, reaction temperature and time, and pulp density, on the leaching of the ore were investigated. Under strong acidic and oxidizing conditions, the sulfide in the ore was dissolved as a sulfate ion, which formed gypsum with Ca(II), leading to a decrease in the leaching percentage of Mo(VI) from the ore. The leaching percentage of molybdenum was greater than 90%, while those of iron, calcium, and silicon were 38, 29, and 67%, respectively, under the optimum conditions: 2.0 M HCl, 0.5 M NaClO3, pulp density of 5 g/L, temperature of 90 °C, and treatment time of 60 min. 몰리브덴은 소재로 널리 사용되므로 광석 또는 2차자원으로부터 회수가 많은 관심을 끌고 있다. 몰리브데나이트광으로부터 산화제로NaClO3를 함유한 염산용액에 의한 몰리브데나이트광의 침출에 대해 조사했다. 염산 및 NaClO3의 농도, 반응 온도 및 시간과 광액밀도가 광석의 침출에 미치는 영향을 조사했다. 산화력이 센 강산용액에서 황화광은 황산이온으로 산화되면서 용해되어 칼슘이온과 gypsum 을 형성하여 몰리브덴(VI)의 침출률을 감소시켰다. 최적조건(2.0 M HCl, 0.5 M NaClO3, 광액밀도 5 g/L, 90, 60분)에서 몰리브덴, 철, 칼슘 및 실리케이트의 침출률은 각각 90, 38, 29 및 67%이었다.
A Hybrid Method Based on Genetic Algorithm and Ant Colony System for Traffic Routing Optimization
Thi-Hau Nguyen,Ha-Nam Nguyen,Dang-Nhac Lu,Duc-Nhan Nguyen International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.8
The Ant Colony System (ACS) is a variant of Ant colony optimization algorithm which is well-known in Traveling Salesman Problem. This paper proposed a hybrid method based on genetic algorithm (GA) and ant colony system (ACS), called GACS, to solve traffic routing problem. In the GACS, we use genetic algorithm to optimize the ACS parameters that aims to attain the shortest trips and time through new functions to help the ants to update global and local pheromones. Our experiments are performed by the GACS framework which is developed from VANETsim with the ability of real map loading from open street map project, and updating traffic light in real-time. The obtained results show that our framework acquired higher performance than A-Star and classical ACS algorithms in terms of length of the best global tour and the time for trip.
Thi Nhan Hau Nguyen,Man Seung Lee 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Printed circuit boards (PCBs) contain precious metals like Au and Pd. Therefore, it is important to recoverthese metals from waste PCBs. A process was developed in this work to recover pure Au powders and Pdcompounds from the aqua regia etching solution of waste PCBs. Au(III) and Pd(II) were separated bycementation with Cu powder from the etching solutions containing Al(III), Cu(II), Fe(III), Na(I), Ni(II),Sn(II) and Zn(II). The Au and Pd metals present in the cemented Cu were dissolved together with Cuby the mixture of HCl and NaClO. Au(III) was separated from the leaching solution of the cemented Cuby solvent extraction with Cyanex 272. Then pure Au powders were recovered from the thiourea strippingsolution by chemical reduction with hydrazine. In order to recover Pd(II) from the raffinate afterextraction of Au(III), Pd(II) was oxidized to Pd(IV) by adding NaClO3 and then pure Pd compound((NH4)2PdCl6) was recovered by precipitation with NH4Cl. Optimum conditions of these steps wereobtained at room temperature. The purity of the recovered Au and Pd compound was higher than 99%.
Detecting user status from smartphone sensor data
Nguyen, Thu-Trang,Nguyen, Thi-Hau,Nguyen, Ha-Nam,Nguyen, Duc-Nhan,Choi, GyooSeok The International Promotion Agency of Culture Tech 2016 International Journal of Advanced Culture Technolo Vol.4 No.1
Due to the high increment in usage and built-in advanced technology of smartphones, human activity recognition relying on smartphone sensor data has become a focused research area. In order to reduce noise of collected data, most of previous studies assume that smartphones are fixed at certain positions. This strategy is impractical for real life applications. To overcome this issue, we here investigate a framework that allows detecting the status of a traveller as idle or moving regardless the position and the direction of smartphones. The application of our work is to estimate the total energy consumption of a traveller during a trip. A number of experiments have been carried out to show the effectiveness of our framework when travellers are not only walking but also using primitive vehicles like motorbikes.